Question

Se f(x) = 3x – 4 e f(g(x)) = x + 4, então g(1) vale:
a) -2
b) 0
c) 1
d) 3
e) 5

Answer 1

3g(x) - 4 = x + 4

3g(x) = x + 4 + 4

3g(x) = x + 8

g(x) = (x + 8)/3

g(1) = (1 + 8)/3

g(1) = 9/3

g(1) = 3